but it works perfectly with audiomulch. it seems it's not a problem of portaudio (afaik ross bencina wrote portaudio and audiomulch), but the combination of portaudio and pd.
We decided to support the development of native drivers for ASIO and Coreaudio since these interfaces seem to be more stable than the Portaudio API and in the end all audio drivers would be native and the Portaudio (source code) overhead be gone. I found it extremely nerve-consuming to search for bugs both in PD and Portaudio and to always find some here and there.
best greetings, Thomas